The present study was designed to evaluate the preventive effects of N-acetyl cysteine on lipid peroxide metabolism in isoproterenol (ISO) induced myocardial infarcted rats. Male albino Wistar rats were pretreated with N-acetyl cysteine (5 and 10 mg/kg) daily for a period of 14 days. After the pretreatment period, ISO (100 mg/kg) was subcutaneously injected to rats twice at an interval of 24 h. Increased activities of serum creatine kinase, creatine kinase-MB, lactate dehydrogenase, and increased intensities of serum lactate dehydrogenase-isoenzyme bands (LDH-1, LDH-2) were observed in ISO-induced rats. The heart lipid peroxidation products were significantly increased, and the antioxidant system was significantly reduced in ISO-induced rats. Pretreatment with N-acetyl cysteine (5 and 10 mg/kg) to ISO-induced rats showed significant effects on all the biochemical parameters studied. Histopathological findings of the myocardium also showed the protective role of N-acetyl cysteine in ISO-induced rats. Furthermore, in vitro study confirmed the potent-free radical scavenging activity of N-acetyl cysteine. The effect at a dose of 10 mg/kg of N-acetyl cysteine was more pronounced than the dose, 5 mg/kg. The results of our study show that N-acetyl cysteine protects the heart against ISO-induced myocardial infarction by its free radical scavenging effect.
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